Parasite Code PAC055 "Parasitic architecture" establishes a relationship between man made structures and their geographical surroundings as a symbiotic coexistence with nature. Using the adaptive mechanisms of parasitic fungi, in surroundings and structure of the building, introduces solutions to many aspects of building: water filtration, map of infrastructure, reconstruction of soil, etc. The concept for dwelling development on geographically challenging terrain required looking at the project not just from the technological and mechanical point of view, but searching for the relationship between the man made building and ecosystem around it. In doing so it was necessary to think of architectural structures as biological organisms. In observing nature I found how resourceful, morphic and adaptive fungi could be. Translating the nature of parasites into technical applications and using fungi directly for soil cultivation and as a biological filter can be the answer to many aspects of urban planning. Using adaptive mechanisms of parasitic fungi in the surroundings and substructure of the building introduces solutions to filtration process of water as well as stabilizing the ground beneath the household. The logic of this "parasitic architecture " is very simple. The foundation is dug and reinforced only for the core functions, which will need to distribute water. It is less labor intensive and economically more efficient. Main and intermediate floors are cantilevered of the central core. Then, everything is covered with lightweight wall construction - fiberglass, plastics, and aluminum. A thick layer of spongy sub floor should ensure that both rainwater and ground water would not be accumulating underneath the structure, but that they will be drained away to the sewer and beyond. Other aspects of nature's resources such as trees, ponds and other vegetation should also be used in conjunction with creating a man made environment. The more nature we can incorporate in the process of building, the longer and better it is going to withstand the measure of time.